Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e266a71d090c47…

MALICIOUS

PDF

79.3 KB Created: 2021-05-18 13:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 621c6241dbb92f471afe53018eddfe8b SHA-1: d45d434405169d72ff7f4b85d5863c951d85f4d5 SHA-256: 28e266a71d090c474495e1e752cfc617c74bcc4b2f8fc4efd821c0d7f4529dd9
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, with a specific heuristic indicating it presents a fake CAPTCHA to the user. This suggests a social engineering tactic to prompt user interaction. The embedded URL points to a domain associated with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pelibifir.ru/strik?utm_term=pokemon+let%2527s+go+eevee+apk+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459034/normal_606acaa0a40e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417419/normal_5fe8c1ba70425.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366662/normal_5fd07e2b5a326.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mijunotunebopub.rf.gd/wepinuwedezibogotut.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/elminsters_forgotten_realms.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/81568558813.pdfIn PDF document text
    • http://nijetazum.epizy.com/vekololorofitawapad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4f23c73-14f0-4e27-9506-d370b4dd3cf7/monitor_de_signos_vitales_comen_c80.pdfIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/behringer_xenyx_x2222_manual_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/mepimutilavekol.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/how_to_read_oxygen_flow_meter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b6d05ee-503e-41ad-b530-06153aa44cf6/korean_essential_vocabulary_6000.pdfIn PDF document text
    • http://tusejuw.epizy.com/34338034036.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/48815883503.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/97084261401.pdfIn PDF document text
    • http://ridezajumoso.epizy.com/3924394562.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/719eb94b-f1f1-4f30-b085-702a5f67ad86/gevokopejagemenedixi.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/what_is_a_rule_12_hearing.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/top_arcade_games_for_pc_free.pdfIn PDF document text
    • http://tikimolanevi.rf.gd/bodybuilding_workout_with_pictures.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D6 5612 bytes
SHA-256: e7fd9538b5916af304f578d82de0978f5b0db0f4ff29368c5d635db7ad24ee68
font_01_sfnt_off00010a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A03 11052 bytes
SHA-256: 6f8a97f5ef55b28307191cb6a2e6ffc8cf7f86ec92f0dc4b981beac06f57957a

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